InterDigital Inc (IDCC)

[Gamco]

United States Patent 7,683,834
Goldberg March 23, 2010

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Undulating transmit patterns for multiple simultaneous transmitters to support signal separation at a receiver


Abstract
A communications system includes multiple mobile wireless communications devices transmitting at a same time to a fixed receiver assembly. Each mobile wireless communications device transmits a source signal defined by a respective character set comprising a plurality of symbols. At least one of the symbols in the respective character sets is transmitted at a different power level so that the transmitted source signal from each mobile wireless communications device appears with linearly independent power level time periods. The linearly independent power level time periods are used by the fixed receiver assembly to populate a mixing matrix for signal separation processing.


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Inventors: Goldberg; Steven J. (Downingtown, PA)
Assignee: InterDigital Technology Corporation (Wilmington, DE)

Appl. No.: 11/612,818
Filed: December 19, 2006

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11233316 Sep., 2005 7190308
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60612435 Sep., 2004
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60612550 Sep., 2004
60612632 Sep., 2004
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60612471 Sep., 2004
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60612469 Sep., 2004
60612547 Sep., 2004
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Current U.S. Class: 342/378 ; 342/377; 702/190
Current International Class: G01S 3/16 (20060101); H01Q 3/00 (20060101)
Field of Search: 342/373,377-378,380,382-383 455/103,105,137-138 702/190-197,FOR164